body {
  margin: 0;
  font-family: PingFang SC, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
    monospace;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.app {
  width: 800px;
  margin: 100px auto;
}

.app button {
  margin-top: 20px;
  margin-right: 20px;
}

hr {
  margin-block: 20px;
}

input {
  margin-right: 20px;
  margin-bottom: 20px;
}
